Crystal structure and magnetic properties of CeFe11M (M = Mo, W)

Raja, Akila; Palasyuk, Olena; Schlagel, Deborah; Lograsso, Thomas; Palasyuk, Andriy

doi:10.1016/j.jmmm.2025.173294

Crystal structure and magnetic properties of CeFe₁₁M (M = Mo, W)

Journal Article · Fri Jun 13 20:00:00 EDT 2025 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2025.173294· OSTI ID:2571575

^[1]; ^[1]; Schlagel, Deborah ^[1]; ^[1]; ^[1]

Ames Laboratory (AMES), Ames, IA (United States)

Tetragonal CeFe₁₁Mo (struct. type ThMn₁₂, a = 8.529(1) Å, c = 4.766(1) Å, V = 346.68(1) Å³) and novel isostructural CeFe₁₁W (a = 8.539(1) Å, c = 4.754(1) Å, V = 346.62(1) Å³) are obtained in bulk, as homogenized single-phase arc-melted alloys. Here, their crystal structures are evaluated by full profile Rietveld analysis of the powder X-ray diffraction patterns which confirm that Ce occupies the 2a atomic site in both cases, whereas atomic disorder is present in the Fe-sublattice, i.e., predominantly on the dumbbell 8i site and minorly on two other sites 8j and 8f. In CeFe₁₁Mo the third element, M, is mixed with Fe on the 8i dumbbell site and 8f atomic position, whereas in CeFe₁₁W, M is mixed on the 8i and 8j Fe sites. In these bulk CeFe_12-xM_x alloys the tetragonal structure persists at lower M content, x < 1 here, in comparison to known similar alloys, with x > 1. Because of the low M content, comparably higher values of mass magnetization and Curie temperature are achieved i.e., CeFe₁₁Mo: ϭ_s = 104 emu/g (14.7 µ_B/f.u.), T_c = 420 K and CeFe₁₁W: ϭ_s = 99 emu/g (16.5 µ_B/f.u.), T_c = 450 K. Magnetocrystalline anisotropy is uniaxial with anisotropy fields H_a ∼ 14.5 and 16.5 kOe, respectively. Based on Curie temperature and magnetic anisotropy enhancements, using tungsten as the stabilizing dopant is more beneficial than molybdenum.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2571575

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 629; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
bulk alloys
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permanent magnet
tetragonal structure
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uniaxial anisotropy

Crystal structure and magnetic properties of CeFe11M (M = Mo, W)

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Crystal structure and magnetic properties of CeFe₁₁M (M = Mo, W)